get/import-url: better handle remote:// notation errors

[jorgeorpinel]

Working inside a fresh clone of https://github.com/iterative/dataset-registry 👍

$ dvc version
DVC version: 0.82.2
Python version: 3.7.6
Platform: Darwin-19.0.0-x86_64-i386-64bit
Binary: False
Package: brew
Cache: reflink - supported, hardlink - supported, symlink - supported

$ dvc get-url -v remote://storage/get-started/data.xml
ERROR: unexpected error - 'NoneType' object has no attribute 'repo'
------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/local/Cellar/dvc/0.82.2/libexec/lib/python3.7/site-packages/dvc/main.py", line 48, in main
    ret = cmd.run()
  File "/usr/local/Cellar/dvc/0.82.2/libexec/lib/python3.7/site-packages/dvc/command/get_url.py", line 17, in run
    Repo.get_url(self.args.url, out=self.args.out)
  File "/usr/local/Cellar/dvc/0.82.2/libexec/lib/python3.7/site-packages/dvc/repo/get_url.py", line 17, in get_url
    dep, = dependency.loads_from(None, [url])
  File "/usr/local/Cellar/dvc/0.82.2/libexec/lib/python3.7/site-packages/dvc/dependency/__init__.py", line 77, in loads_from
    ret.append(_get(stage, s, info))
  File "/usr/local/Cellar/dvc/0.82.2/libexec/lib/python3.7/site-packages/dvc/dependency/__init__.py", line 52, in _get
    remote = Remote(stage.repo, name=parsed.netloc)
AttributeError: 'NoneType' object has no attribute 'repo'
------------------------------------------------------------

Discord: https://discordapp.com/channels/485586884165107732/563406153334128681/670363031330619392

[jorgeorpinel]

p.s. is it expected that getimport/get-url do NOT support remote:// URLs? I mean, they could (when inside a DVC repo).

[efiop]

@jorgeorpinel Yes, it is, because they work without any notion of the repo they are working on, they are not even parsing global or system configs, where remote definitions might be.

[jorgeorpinel]

Sounds like this is a non-issue.

[jorgeorpinel]

I think?

[dberenbaum]

@jorgeorpinel It seems the behavior is expected. Is there a docs issue?

[jorgeorpinel]

Actually there is some error related to this in https://dvc.org/doc/command-reference/get-url, yes. Solving in iterative/dvc.org@1533182

But I'm not sure what import-url does (vs what it should do)... Let me check ⌛